Visual FoxPro

Send a Staged REST Request with a Streamed Body

Demonstrates Rest.SendReqStreamBody, which sends a request whose body is read from a Stream, then reads the response in separate steps.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnBAutoReconnect
LOCAL loBodyStream
LOCAL lnStatusCode
LOCAL lcResponseBody

lnSuccess = 0

loRest = CreateObject('Chilkat.Rest')
lnBTls = 1
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("example.com",443,lnBTls,lnBAutoReconnect)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

*  The file paths are relative to the application's current working directory.  Absolute paths
*  may also be used.  Supply the paths appropriate to your own environment.

*  The request body is read from a Stream whose source is a local file.
loBodyStream = CreateObject('Chilkat.Stream')
loBodyStream.SourceFile = "qa_data/upload.json"

loRest.AddHeader("Content-Type","application/json")

*  Send the request, reading the body from the stream.  The 3rd argument is the Stream.
lnSuccess = loRest.SendReqStreamBody("POST","/api/upload",loBodyStream)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loBodyStream
    CANCEL
ENDIF

*  After sending, read the response status line and header fields.  The return value is the HTTP
*  status code, or -1 if no response was received.
lnStatusCode = loRest.ReadResponseHeader()
IF (lnStatusCode < 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loBodyStream
    CANCEL
ENDIF

? "Response status code: " + STR(lnStatusCode)

*  Read the response body as text.
lcResponseBody = loRest.ReadRespBodyString()
IF (loRest.LastMethodSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loBodyStream
    CANCEL
ENDIF

? lcResponseBody

RELEASE loRest
RELEASE loBodyStream